18291827947 has 2 divisors, whose sum is σ = 18291827948. Its totient is φ = 18291827946.

The previous prime is 18291827929. The next prime is 18291827969. The reversal of 18291827947 is 74972819281.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18291827947 - 2⁷ = 18291827819 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18291827891 and 18291827900.

It is not a weakly prime, because it can be changed into another prime (18291887947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9145913973 + 9145913974.

It is an arithmetic number, because the mean of its divisors is an integer number (9145913974).

Almost surely, 2^18291827947 is an apocalyptic number.

18291827947 is a deficient number, since it is larger than the sum of its proper divisors (1).

18291827947 is an equidigital number, since it uses as much as digits as its factorization.

18291827947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4064256, while the sum is 58.

The spelling of 18291827947 in words is "eighteen billion, two hundred ninety-one million, eight hundred twenty-seven thousand, nine hundred forty-seven".